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Thread: very high idle mystery- not the IAC valve

  1. #1
    Join Date
    Jun 2010

    very high idle mystery- not the IAC valve

    My 2001 Chrysler Town & ciuntry suddenly developed a racing idle, around 3K in neutral.

    I got code P1294 which suggests a vacuum leak or a bad IAC valve, right?

    I changed the IAC valve and it did not fix the problem.

    What next?

    Anyone know what the voltage is supposed to be at the plug to the idle air control valve?


    Dave Silva

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  3. #2
    Join Date
    Oct 2003
    Niagara Ontario

    Look for a vacuum leak.
    07 Dodge Caravan SXT 3.3L Gold 135,000 kms
    05 Dodge Caravan SE 3.3L Silver 200,000 kms now sold and replaced with a 13 Journey.
    84, 89, 93, 94, 95 Chrysler minivans in my past, all served me well and are long gone.
    90 Shadow long gone

  4. #3
    Join Date
    Jun 2009
    Jefferson City, TN

    Could be a vacuum leak. Also if your throttle body is REALLY covered over with gunky carbon build-up it may not be letting the throttle plate close all the way. If you try to manually close the throttle body, does the idle go down? Does the gas pedal stick any when you first press on it?
    2007 Grand Caravan/3.8L V6/103K mi/original 41TE
    2006 300C/5.7L HEMI V8/128/K mi/original W5A580
    2002 PT Cruiser/2.4L I4/139K mi/original 40TE
    1992 S-10/4.3L V6/249K mi/original 4L60E
    Previous minivans:
    1997 Grand Voyager SE/traded@192K mi/3.3L V6/original 41TE
    2003 Grand Caravan Sport/3.8L V6/traded@124K mi/original 41TE
    2007 T&C/3.8L V6/traded@44K mi/ original 41TE
    2010 T&C Touring/3.8L V6/the ex's@72K mi/original 62TE

  5. #4
    Join Date
    Jul 2008
    Niles Il.

    Enough airflow AND computer knowledge to run 3k rpms has to be the throttle plate stuck open somehow. I would pull the intake hose and take a look as suggested by jgbat.
    Candy the van. '98 Sport 3.8L 132,200 miles. Used trans at ~96k. Great piece of my life and a fine van.

    '69 GTO drop top

  6. #5
    T&CFan Guest

    Or maybe a varmint got wedged in there trying to get out of the cold.

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